Color dusty gray weigh around a ounce. Length 2 to 4 inches, Life span 1-2 years. These guys only need 1/4 opening to get into your home. That is less than half the size of your pinkie finger. Litter size 5 to 7 pups. Will have up to 10 litters a year. Nocturnal; most feeding occurs 30 minutes after sunset. Scientific name Mus Musculus meaning "little thief"
Reddish-brown to golden brown, white feet & chest. Large black eyes, large furred ears. Not normally found in city unless you live next to fields. Larger than a house mouse. Will stay 25 to 30 feet from food source. Found around trees, barns, garages. Most infestation in homes I have come across has been after a field has been cut.
These rats can get huge almost 16" in length. If your feeding chickens these guys always seem to show up. Mild winters and new construction also has played a role in their increased population.